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gv.c
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gv.c
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/* gv.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
* 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
* of your inquisitiveness, I shall spend all the rest of my days answering
* you. What more do you want to know?'
* 'The names of all the stars, and of all living things, and the whole
* history of Middle-earth and Over-heaven and of the Sundering Seas,'
* laughed Pippin.
*/
/*
=head1 GV Functions
A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
It is a structure that holds a pointer to a scalar, an array, a hash etc,
corresponding to $foo, @foo, %foo.
GVs are usually found as values in stashes (symbol table hashes) where
Perl stores its global variables.
=cut
*/
#include "EXTERN.h"
#define PERL_IN_GV_C
#include "perl.h"
#include "overload.c"
const char S_autoload[] = "AUTOLOAD";
const STRLEN S_autolen = sizeof(S_autoload)-1;
#ifdef PERL_DONT_CREATE_GVSV
GV *
Perl_gv_SVadd(pTHX_ GV *gv)
{
if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
Perl_croak(aTHX_ "Bad symbol for scalar");
if (!GvSV(gv))
GvSV(gv) = newSV(0);
return gv;
}
#endif
GV *
Perl_gv_AVadd(pTHX_ register GV *gv)
{
if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
Perl_croak(aTHX_ "Bad symbol for array");
if (!GvAV(gv))
GvAV(gv) = newAV();
return gv;
}
GV *
Perl_gv_HVadd(pTHX_ register GV *gv)
{
if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
Perl_croak(aTHX_ "Bad symbol for hash");
if (!GvHV(gv))
GvHV(gv) = newHV();
return gv;
}
GV *
Perl_gv_IOadd(pTHX_ register GV *gv)
{
if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) {
/*
* if it walks like a dirhandle, then let's assume that
* this is a dirhandle.
*/
const char * const fh =
PL_op->op_type == OP_READDIR ||
PL_op->op_type == OP_TELLDIR ||
PL_op->op_type == OP_SEEKDIR ||
PL_op->op_type == OP_REWINDDIR ||
PL_op->op_type == OP_CLOSEDIR ?
"dirhandle" : "filehandle";
Perl_croak(aTHX_ "Bad symbol for %s", fh);
}
if (!GvIOp(gv)) {
#ifdef GV_UNIQUE_CHECK
if (GvUNIQUE(gv)) {
Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
}
#endif
GvIOp(gv) = newIO();
}
return gv;
}
GV *
Perl_gv_fetchfile(pTHX_ const char *name)
{
return gv_fetchfile_flags(name, strlen(name), 0);
}
GV *
Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
const U32 flags)
{
char smallbuf[128];
char *tmpbuf;
const STRLEN tmplen = namelen + 2;
GV *gv;
PERL_UNUSED_ARG(flags);
if (!PL_defstash)
return NULL;
if (tmplen <= sizeof smallbuf)
tmpbuf = smallbuf;
else
Newx(tmpbuf, tmplen, char);
/* This is where the debugger's %{"::_<$filename"} hash is created */
tmpbuf[0] = '_';
tmpbuf[1] = '<';
memcpy(tmpbuf + 2, name, namelen);
gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
if (!isGV(gv)) {
gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
#ifdef PERL_DONT_CREATE_GVSV
GvSV(gv) = newSVpvn(name, namelen);
#else
sv_setpvn(GvSV(gv), name, namelen);
#endif
if (PERLDB_LINE || PERLDB_SAVESRC)
hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
}
if (tmpbuf != smallbuf)
Safefree(tmpbuf);
return gv;
}
/*
=for apidoc gv_const_sv
If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
inlining, or C<gv> is a placeholder reference that would be promoted to such
a typeglob, then returns the value returned by the sub. Otherwise, returns
NULL.
=cut
*/
SV *
Perl_gv_const_sv(pTHX_ GV *gv)
{
if (SvTYPE(gv) == SVt_PVGV)
return cv_const_sv(GvCVu(gv));
return SvROK(gv) ? SvRV(gv) : NULL;
}
GP *
Perl_newGP(pTHX_ GV *const gv)
{
GP *gp;
const char *const file
= (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
#ifdef USE_ITHREADS
if (PL_curcop && PL_curcop->op_flags & OPf_COP_TEMP) {
/* The COP's CopFILE is likely to go away soon, so we can't simply point
to it. There is no provision to free memory at GP destruction, so we
cheat wholesale and store it within the same memory as is allocated
for the GP itself. This hack isn't needed in 5.10 and later, where
the char *gp_file has been replaced by a (reference counted) pointer
to a shared hash key. */
const STRLEN len = strlen(file) + 1;
Newxc(gp, sizeof(GP) + len, char, GP);
Zero(gp, 1, GP);
gp->gp_file = (char *) gp + 1;
Copy(file, gp + 1, len, char);
} else
#endif
{
Newxz(gp, 1, GP);
/* XXX Ideally this cast would be replaced with a change to const char*
in the struct. */
gp->gp_file = (char *) file;
}
#ifndef PERL_DONT_CREATE_GVSV
gp->gp_sv = newSV(0);
#endif
gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
gp->gp_egv = gv;
gp->gp_refcnt = 1;
return gp;
}
void
Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
{
const bool doproto = SvTYPE(gv) > SVt_NULL;
char * const proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
assert (!(proto && has_constant));
if (has_constant) {
/* The constant has to be a simple scalar type. */
switch (SvTYPE(has_constant)) {
case SVt_PVAV:
case SVt_PVHV:
case SVt_PVCV:
case SVt_PVFM:
case SVt_PVIO:
Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
sv_reftype(has_constant, 0));
default: NOOP;
}
SvRV_set(gv, NULL);
SvROK_off(gv);
}
sv_upgrade((SV*)gv, SVt_PVGV);
if (SvLEN(gv)) {
if (proto) {
SvPV_set(gv, NULL);
SvLEN_set(gv, 0);
SvPOK_off(gv);
} else
Safefree(SvPVX_mutable(gv));
}
GvGP(gv) = Perl_newGP(aTHX_ gv);
sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, NULL, 0);
GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
gv_name_set(gv, name, len, GV_ADD);
if (multi || doproto) /* doproto means it _was_ mentioned */
GvMULTI_on(gv);
if (doproto) { /* Replicate part of newSUB here. */
SvIOK_off(gv);
ENTER;
if (has_constant) {
/* newCONSTSUB takes ownership of the reference from us. */
GvCV(gv) = newCONSTSUB(stash, (char *)name, has_constant);
/* If this reference was a copy of another, then the subroutine
must have been "imported", by a Perl space assignment to a GV
from a reference to CV. */
if (exported_constant)
GvIMPORTED_CV_on(gv);
} else {
/* XXX unsafe for 5005 threads if eval_owner isn't held */
(void) start_subparse(0,0); /* Create empty CV in compcv. */
GvCV(gv) = PL_compcv;
}
LEAVE;
PL_sub_generation++;
CvGV(GvCV(gv)) = gv;
CvFILE_set_from_cop(GvCV(gv), PL_curcop);
CvSTASH(GvCV(gv)) = PL_curstash;
#ifdef USE_5005THREADS
CvOWNER(GvCV(gv)) = 0;
if (!CvMUTEXP(GvCV(gv))) {
New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex);
MUTEX_INIT(CvMUTEXP(GvCV(gv)));
}
#endif /* USE_5005THREADS */
if (proto) {
sv_setpv((SV*)GvCV(gv), proto);
Safefree(proto);
}
}
}
STATIC void
S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
{
switch (sv_type) {
case SVt_PVIO:
(void)GvIOn(gv);
break;
case SVt_PVAV:
(void)GvAVn(gv);
break;
case SVt_PVHV:
(void)GvHVn(gv);
break;
#ifdef PERL_DONT_CREATE_GVSV
case SVt_NULL:
case SVt_PVCV:
case SVt_PVFM:
case SVt_PVGV:
break;
default:
if(GvSVn(gv)) {
/* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
If we just cast GvSVn(gv) to void, it ignores evaluating it for
its side effect */
}
#endif
}
}
/*
=for apidoc gv_fetchmeth
Returns the glob with the given C<name> and a defined subroutine or
C<NULL>. The glob lives in the given C<stash>, or in the stashes
accessible via @ISA and UNIVERSAL::.
The argument C<level> should be either 0 or -1. If C<level==0>, as a
side-effect creates a glob with the given C<name> in the given C<stash>
which in the case of success contains an alias for the subroutine, and sets
up caching info for this glob. Similarly for all the searched stashes.
This function grants C<"SUPER"> token as a postfix of the stash name. The
GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
visible to Perl code. So when calling C<call_sv>, you should not use
the GV directly; instead, you should use the method's CV, which can be
obtained from the GV with the C<GvCV> macro.
=cut
*/
GV *
Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
{
AV* av;
GV* topgv;
GV* gv;
GV** gvp;
CV* cv;
const char *hvname;
HV* lastchance = NULL;
/* UNIVERSAL methods should be callable without a stash */
if (!stash) {
level = -1; /* probably appropriate */
if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
return 0;
}
hvname = HvNAME_get(stash);
if (!hvname)
Perl_croak(aTHX_
"Can't use anonymous symbol table for method lookup");
if ((level > 100) || (level < -100))
Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
name, hvname);
DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
if (!gvp)
topgv = NULL;
else {
topgv = *gvp;
if (SvTYPE(topgv) != SVt_PVGV)
gv_init(topgv, stash, name, len, TRUE);
if ((cv = GvCV(topgv))) {
/* If genuine method or valid cache entry, use it */
if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
return topgv;
/* Stale cached entry: junk it */
SvREFCNT_dec(cv);
GvCV(topgv) = cv = Nullcv;
GvCVGEN(topgv) = 0;
}
else if (GvCVGEN(topgv) == PL_sub_generation)
return 0; /* cache indicates sub doesn't exist */
}
gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
av = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL;
/* create and re-create @.*::SUPER::ISA on demand */
{
STRLEN packlen = strlen(hvname);
if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
HV* basestash;
packlen -= 7;
basestash = gv_stashpvn(hvname, packlen, GV_ADD);
gvp = (GV**)hv_fetchs(basestash, "ISA", FALSE);
if (gvp && (gv = *gvp) && isGV_with_GP(gv) && (av = GvAV(gv))) {
gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
if (!gvp || !(gv = *gvp))
Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
if (SvTYPE(gv) != SVt_PVGV)
gv_init(gv, stash, "ISA", 3, TRUE);
SvREFCNT_dec(GvAV(gv));
GvAV(gv) = (AV*)SvREFCNT_inc_simple(av);
}
}
}
if (av) {
SV** svp = AvARRAY(av);
/* NOTE: No support for tied ISA */
I32 items = AvFILLp(av) + 1;
while (items--) {
SV* const sv = *svp++;
HV* const basestash = gv_stashsv(sv, 0);
if (!basestash) {
if (ckWARN(WARN_MISC))
Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
(void*)sv, hvname);
continue;
}
gv = gv_fetchmeth(basestash, name, len,
(level >= 0) ? level + 1 : level - 1);
if (gv)
goto gotcha;
}
}
/* if at top level, try UNIVERSAL */
if (level == 0 || level == -1) {
lastchance = gv_stashpvs("UNIVERSAL", 0);
if (lastchance) {
if ((gv = gv_fetchmeth(lastchance, name, len,
(level >= 0) ? level + 1 : level - 1)))
{
gotcha:
/*
* Cache method in topgv if:
* 1. topgv has no synonyms (else inheritance crosses wires)
* 2. method isn't a stub (else AUTOLOAD fails spectacularly)
*/
if (topgv &&
GvREFCNT(topgv) == 1 &&
(cv = GvCV(gv)) &&
(CvROOT(cv) || CvXSUB(cv)))
{
if ((cv = GvCV(topgv)))
SvREFCNT_dec(cv);
GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
GvCVGEN(topgv) = PL_sub_generation;
}
return gv;
}
else if (topgv && GvREFCNT(topgv) == 1) {
/* cache the fact that the method is not defined */
GvCVGEN(topgv) = PL_sub_generation;
}
}
}
return 0;
}
/*
=for apidoc gv_fetchmeth_autoload
Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
Returns a glob for the subroutine.
For an autoloaded subroutine without a GV, will create a GV even
if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
of the result may be zero.
=cut
*/
GV *
Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
{
GV *gv = gv_fetchmeth(stash, name, len, level);
if (!gv) {
CV *cv;
GV **gvp;
if (!stash)
return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
return NULL;
if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
return NULL;
cv = GvCV(gv);
if (!(CvROOT(cv) || CvXSUB(cv)))
return NULL;
/* Have an autoload */
if (level < 0) /* Cannot do without a stub */
gv_fetchmeth(stash, name, len, 0);
gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
if (!gvp)
return NULL;
return *gvp;
}
return gv;
}
/*
=for apidoc gv_fetchmethod_autoload
Returns the glob which contains the subroutine to call to invoke the method
on the C<stash>. In fact in the presence of autoloading this may be the
glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
already setup.
The third parameter of C<gv_fetchmethod_autoload> determines whether
AUTOLOAD lookup is performed if the given method is not present: non-zero
means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
with a non-zero C<autoload> parameter.
These functions grant C<"SUPER"> token as a prefix of the method name. Note
that if you want to keep the returned glob for a long time, you need to
check for it being "AUTOLOAD", since at the later time the call may load a
different subroutine due to $AUTOLOAD changing its value. Use the glob
created via a side effect to do this.
These functions have the same side-effects and as C<gv_fetchmeth> with
C<level==0>. C<name> should be writable if contains C<':'> or C<'
''>. The warning against passing the GV returned by C<gv_fetchmeth> to
C<call_sv> apply equally to these functions.
=cut
*/
/* FIXME. If changing this function note the comment in pp_hot's
S_method_common:
This code tries to figure out just what went wrong with
gv_fetchmethod. It therefore needs to duplicate a lot of
the internals of that function. ...
I'd guess that with one more flag bit that could all be moved inside
here.
*/
GV *
Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
{
register const char *nend;
const char *nsplit = NULL;
GV* gv;
HV* ostash = stash;
if (stash && SvTYPE(stash) < SVt_PVHV)
stash = NULL;
for (nend = name; *nend; nend++) {
if (*nend == '\'')
nsplit = nend;
else if (*nend == ':' && *(nend + 1) == ':')
nsplit = ++nend;
}
if (nsplit) {
const char * const origname = name;
name = nsplit + 1;
if (*nsplit == ':')
--nsplit;
if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
/* ->SUPER::method should really be looked up in original stash */
SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
CopSTASHPV(PL_curcop)));
/* __PACKAGE__::SUPER stash should be autovivified */
stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), GV_ADD);
DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
origname, HvNAME_get(stash), name) );
}
else {
/* don't autovifify if ->NoSuchStash::method */
stash = gv_stashpvn(origname, nsplit - origname, 0);
/* however, explicit calls to Pkg::SUPER::method may
happen, and may require autovivification to work */
if (!stash && (nsplit - origname) >= 7 &&
strnEQ(nsplit - 7, "::SUPER", 7) &&
gv_stashpvn(origname, nsplit - origname - 7, 0))
stash = gv_stashpvn(origname, nsplit - origname, GV_ADD);
}
ostash = stash;
}
gv = gv_fetchmeth(stash, name, nend - name, 0);
if (!gv) {
if (strEQ(name,"import") || strEQ(name,"unimport"))
gv = (GV*)&PL_sv_yes;
else if (autoload)
gv = gv_autoload4(ostash, name, nend - name, TRUE);
}
else if (autoload) {
CV* const cv = GvCV(gv);
if (!CvROOT(cv) && !CvXSUB(cv)) {
GV* stubgv;
GV* autogv;
if (CvANON(cv))
stubgv = gv;
else {
stubgv = CvGV(cv);
if (GvCV(stubgv) != cv) /* orphaned import */
stubgv = gv;
}
autogv = gv_autoload4(GvSTASH(stubgv),
GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
if (autogv)
gv = autogv;
}
}
return gv;
}
GV*
Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
{
GV* gv;
CV* cv;
HV* varstash;
GV* vargv;
SV* varsv;
const char *packname = "";
if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
return NULL;
if (stash) {
if (SvTYPE(stash) < SVt_PVHV) {
packname = SvPV_nolen_const((SV*)stash);
stash = NULL;
}
else {
packname = HvNAME_get(stash);
}
}
if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
return NULL;
cv = GvCV(gv);
if (!(CvROOT(cv) || CvXSUB(cv)))
return NULL;
/*
* Inheriting AUTOLOAD for non-methods works ... for now.
*/
if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
&& ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
)
Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
"Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
packname, (int)len, name);
#ifndef USE_5005THREADS
if (CvISXSUB(cv)) {
/* rather than lookup/init $AUTOLOAD here
* only to have the XSUB do another lookup for $AUTOLOAD
* and split that value on the last '::',
* pass along the same data via some unused fields in the CV
*/
CvSTASH(cv) = stash;
SvPV_set(cv, (char *)name); /* cast to lose constness warning */
SvCUR_set(cv, len);
return gv;
}
#endif
/*
* Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
* The subroutine's original name may not be "AUTOLOAD", so we don't
* use that, but for lack of anything better we will use the sub's
* original package to look up $AUTOLOAD.
*/
varstash = GvSTASH(CvGV(cv));
vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
ENTER;
#ifdef USE_5005THREADS
sv_lock((SV *)varstash);
#endif
if (!isGV(vargv)) {
gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
#ifdef PERL_DONT_CREATE_GVSV
GvSV(vargv) = newSV(0);
#endif
}
LEAVE;
varsv = GvSVn(vargv);
#ifdef USE_5005THREADS
sv_lock(varsv);
#endif
sv_setpv(varsv, packname);
sv_catpvs(varsv, "::");
sv_catpvn(varsv, name, len);
return gv;
}
/* The "gv" parameter should be the glob known to Perl code as *!
* The scalar must already have been magicalized.
*/
STATIC void
S_require_errno(pTHX_ GV *gv)
{
HV* stash = gv_stashpvs("Errno", 0);
if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
dSP;
ENTER;
save_scalar(gv); /* keep the value of $! */
PUSHSTACKi(PERLSI_MAGIC);
Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
newSVpvs("Errno"), NULL);
POPSTACK;
LEAVE;
SPAGAIN;
stash = gv_stashpvs("Errno", 0);
if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
}
}
/*
=for apidoc gv_stashpv
Returns a pointer to the stash for a specified package. Uses C<strlen> to
determine the length of C<name>, then calls C<gv_stashpvn()>.
=cut
*/
HV*
Perl_gv_stashpv(pTHX_ const char *name, I32 create)
{
return gv_stashpvn(name, strlen(name), create);
}
/*
=for apidoc gv_stashpvn
Returns a pointer to the stash for a specified package. The C<namelen>
parameter indicates the length of the C<name>, in bytes. C<flags> is passed
to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
created if it does not already exist. If the package does not exist and
C<flags> is 0 (or any other setting that does not create packages) then NULL
is returned.
=cut
*/
HV*
Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
{
char smallbuf[128];
char *tmpbuf;
HV *stash;
GV *tmpgv;
if (namelen + 2 <= sizeof smallbuf)
tmpbuf = smallbuf;
else
Newx(tmpbuf, namelen + 2, char);
Copy(name,tmpbuf,namelen,char);
tmpbuf[namelen++] = ':';
tmpbuf[namelen++] = ':';
tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, flags, SVt_PVHV);
if (tmpbuf != smallbuf)
Safefree(tmpbuf);
if (!tmpgv)
return NULL;
if (!GvHV(tmpgv))
GvHV(tmpgv) = newHV();
stash = GvHV(tmpgv);
if (!HvNAME_get(stash))
hv_name_set(stash, name, namelen, 0);
return stash;
}
/*
=for apidoc gv_stashsv
Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
=cut
*/
HV*
Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
{
STRLEN len;
const char * const ptr = SvPV_const(sv,len);
return gv_stashpvn(ptr, len, flags);
}
GV *
Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
STRLEN len = strlen (nambeg);
return gv_fetchpvn_flags(nambeg, len, add, sv_type);
}
GV *
Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
STRLEN len;
const char *nambeg = SvPV(name, len);
return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
}
GV *
Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
I32 sv_type)
{
register const char *name = nambeg;
register GV *gv = NULL;
GV**gvp;
I32 len;
register const char *name_cursor;
HV *stash = NULL;
const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
const I32 no_expand = flags & GV_NOEXPAND;
const I32 add = flags & ~GV_NOADD_MASK;
const char *const name_end = nambeg + full_len;
const char *const name_em1 = name_end - 1;
U32 faking_it;
if (flags & GV_NOTQUAL) {
/* Caller promised that there is no stash, so we can skip the check. */
len = full_len;
goto no_stash;
}
if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
/* accidental stringify on a GV? */
name++;
}
for (name_cursor = name; name_cursor < name_end; name_cursor++) {
if ((*name_cursor == ':' && name_cursor < name_em1
&& name_cursor[1] == ':')
|| (*name_cursor == '\'' && name_cursor[1]))
{
if (!stash)
stash = PL_defstash;
if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
return NULL;
len = name_cursor - name;
if (len > 0) {
char smallbuf[128];
char *tmpbuf;
if (len + 2 <= (I32)sizeof (smallbuf))
tmpbuf = smallbuf;
else
Newx(tmpbuf, len+2, char);
Copy(name, tmpbuf, len, char);
tmpbuf[len++] = ':';
tmpbuf[len++] = ':';
gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
gv = gvp ? *gvp : NULL;
if (gv && gv != (GV*)&PL_sv_undef) {
if (SvTYPE(gv) != SVt_PVGV)
gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
else
GvMULTI_on(gv);
}
if (tmpbuf != smallbuf)
Safefree(tmpbuf);
if (!gv || gv == (GV*)&PL_sv_undef)
return NULL;
if (!(stash = GvHV(gv)))
stash = GvHV(gv) = newHV();
if (!HvNAME_get(stash))
hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
}
if (*name_cursor == ':')
name_cursor++;
name_cursor++;
name = name_cursor;
if (name == name_end)
return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
}
}
len = name_cursor - name;
/* No stash in name, so see how we can default */
if (!stash) {
no_stash:
if (len && isIDFIRST_lazy(name)) {
bool global = FALSE;
switch (len) {
case 1:
if (*name == '_')
global = TRUE;
break;
case 3:
if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
|| (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
|| (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
global = TRUE;
break;
case 4:
if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
&& name[3] == 'V')
global = TRUE;
break;
case 5:
if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
&& name[3] == 'I' && name[4] == 'N')
global = TRUE;
break;
case 6:
if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
&&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
global = TRUE;
break;
case 7:
if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
&& name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
&& name[6] == 'T')
global = TRUE;
break;
}
if (global)
stash = PL_defstash;
else if (IN_PERL_COMPILETIME) {
stash = PL_curstash;
if (add && (PL_hints & HINT_STRICT_VARS) &&
sv_type != SVt_PVCV &&
sv_type != SVt_PVGV &&
sv_type != SVt_PVFM &&
sv_type != SVt_PVIO &&
!(len == 1 && sv_type == SVt_PV &&
(*name == 'a' || *name == 'b')) )
{
gvp = (GV**)hv_fetch(stash,name,len,0);
if (!gvp ||
*gvp == (GV*)&PL_sv_undef ||
SvTYPE(*gvp) != SVt_PVGV)
{
stash = NULL;
}
else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
(sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
(sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
{
Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
sv_type == SVt_PVAV ? '@' :
sv_type == SVt_PVHV ? '%' : '$',
name);
if (GvCVu(*gvp))
Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
stash = NULL;
}
}
}
else
stash = CopSTASH(PL_curcop);
}
else
stash = PL_defstash;
}
/* By this point we should have a stash and a name */
if (!stash) {
if (add) {
SV * const err = Perl_mess(aTHX_
"Global symbol \"%s%s\" requires explicit package name",
(sv_type == SVt_PV ? "$"
: sv_type == SVt_PVAV ? "@"
: sv_type == SVt_PVHV ? "%"
: ""), name);
if (USE_UTF8_IN_NAMES)
SvUTF8_on(err);
qerror(err);
stash = PL_nullstash;
}
else
return NULL;
}
if (!SvREFCNT(stash)) /* symbol table under destruction */
return NULL;
gvp = (GV**)hv_fetch(stash,name,len,add);